In terms of sizing, they had plenty. If you're an XS and looking to grab some of these pieces act sooner rather than later. I actually stopped by Uniqlo last night and the sizing was similar to the opening day - plenty were available but smaller sizes were more sparse.
My personal faves of the collection are the layered tank with geometric print (above left) and jersey printed dress (above right).Costello Tagliapietra and Charlotte Ronson collaborations, fear not - there are still quite a few pieces available. Just head to the back half of the store on the first floor by the main cash.